Proton Mail is famous for its privacy and security. The cool trick they do is that not even Proton can decode your email. That’s because it never exists on their systems as plain text — it’s always…
Also emails for the most part are not e2ee, they can’t be because the other party is not using encryption. They use “zero-access” which is different. It means proton gets the email in clear text, encrypts it with your public PGP key, deletes the original, and sends it to you.
The email is encrypted in transit using TLS. It is then unencrypted and re-encrypted (by us) for storage on our servers using zero-access encryption. Once zero-access encryption has been applied, no-one except you can access emails stored on our servers (including us). It is not end-to-end encrypted, however, and might be accessible to the sender’s email service.
Scribe can be local, if that’s what you are referring to.
They also have a specific section on it at https://proton.me/support/proton-scribe-writing-assistant#local-or-server
Also emails for the most part are not e2ee, they can’t be because the other party is not using encryption. They use “zero-access” which is different. It means proton gets the email in clear text, encrypts it with your public PGP key, deletes the original, and sends it to you.
See https://proton.me/support/proton-mail-encryption-explained